The LM Snoopy's ascent stage approaching the CSM Charlie Brown for docking, 18-26 May 1969

Vintage chromogenic print on fiber-based paper, printed 1969, numbered "NASA AS10-34-5116" in red in top margin, with NASA caption (MSC) and "A KODAK PAPER" watermark on verso, 20,3 x 25,4 cm

Thomas Stafford and Eugene Cernan flew Snoopy to within 9 miles of the Moon’s surface testing systems and procedures.
Then they jettisoned the LM’s descent stage and returned to meet the CSM Charlie Brown in higher lunar orbit at an altitude of about 60 nautical miles.

Unlike the subsequent Apollo 11 ascent stage (and all that followed it), which was left in lunar orbit to eventually crash into the lunar surface, Snoopy’s ascent stage was sent on a trajectory past the Moon into a heliocentric orbit. This was not tracked after 1969, and Snoopy’s location remained unknown until 2011, when a group of amateur astronomers based in the UK started a project to search for it. The Royal Astronomical Society announced a possible rediscovery of Snoopy in 2019, positing that asteroid “2018 AV2,” which is roughly the size of a school bus, is likely the capsule.
The Apollo 10 LM Snoopy is the only once-manned spacecraft still in outer space without a crew.

From the mission transcript during the docking with Charlie Brown:
106:19:13 Engle (Mission control): Snoopy, this is Houston. How do you read me?
106:19:15 Stafford (Snoopy): So far it looks good.
106:19:19 Cernan (Snoopy): Hey, Joe. We’re about ready to dock. Stand by.
106:19:21 Engle: Very good.
106:19:22 Stafford (Snoopy): Don’t call us. We’ll call you.
106:19:23 Engle: Roger that.
106:20:14 Stafford (Snoopy): OK, John. You’re in to about 5 feet, babe. Looking beautiful. [...]
106:21:14 Cernan (Snoopy): We got a capture, John. Fire when you’re ready. [...]
106:22:12 Stafford (Snoopy): Hello, Houston. Snoopy and Charlie Brown are hugging each other.